Variable-stroke pump-operating mechanism



`July 29, 1930 A. ABRAMsoN 1,771,907

VARIABLE STROKE PUMP oPERATING MEGHANISII Filed Nov. 9, 1928 vis# mmm

17 bramsan /NveN-ro R Patented July .29, 1930 UNITED STATES ALEXANDER ABRAMSON, F PRAGUE-WEINBERG-E, CZECHOSLOVAKIA VARIABLESTROKE PUMP-OPERATING MECHANISM Application led November 9, 1928, Serial No. 318,187, and in Czechoslovakia November 22, 1927.

This invention relates to a device for converting in a regulable manner rotary motion into reciprocatlngmotion, more particularly for operating fuel pumps for internal combustion engines and consists substantially in this, that from the rotary member there is derived uninterruptedly or at intervals of time a reciprocatmg motion of a wedge'- shaped member which is yieldingly held and l0 guided against it and with respect to the inclined surfaceof which the member performing the desired main motion can be set under pressure and regulably. Applied to the operation' of fuel pumps for internal combustion engines the device is constructed in such a manner that the pump piston presses a ball which is guided axially with respect to its axis against a reciprocated inclined surface, the arrangement being such that by altering the position of the ball relative to the inclined surface the time and duration of the action of the inclined surfaceon the ball and consequently on the pumpv piston can be varied. This also causes an alteration in the stroke of the piston and the operative space in the pump cylinder.

In the accompanying drawing Figs. 1, 2

and 3 show three constructional examples of the device in section, as applied to the operation of a fuel pump for internal combustion engines. l v

In the example shown in Fig. 1 against the cam 1 of the continuous rotating shaft 2 a sliding member 4 which is guided i'n the which screws in ya nut 10l which is secured against axial displacement and can be turned by means of a lever 18. by a spring 12 against the ball 6.

Thus they main motion of the piston 11` is derived from the reciprocating auxiliary mo- ,of the valves 13 and 1.5 is limited by the `the bottom of the hole in the guide.

The piston 11 is held tion of the inclined surface 5.' This main motion is regulable, as, by 'turning the nut 10 in one direction or the other, the ball 6v is caused to approach or recede from the inclined surface 5 or is adjusted on the inclined 55 surface itself, whereby, owing to the motion of the sliding member 4 remaining constant, the time and duration of the action of the inclined surface on the ball 6 can be varied. With the displacement of the ball with respect to or on the incl-ined surface 5 the operative space in the pump cylinder, the quantity delivered by the pump and the stroke of the piston are determined.

The pump is fed at :v through the suction valve 13 Which allows the liquid to enter through a narrow passage 14 in the wall of the pump cylinder into the pump cylinder and below the delivery valve 15. The motion pins 16 and 17. A

In the constructional form shown in Fig. 2 the cover 20. of the piston pump, in which is the delivery valve 15, also acts as the means for limiting the stroke of the Valve 13, thereby reducing the clearance of the pump to a minimum.

In other respects this constructional form differs from that shown in Fig. 1 only in this, that the sliding member 4 is slidable in a guide 21 between the operating ca'm 1 and a spring 22 which vfinds an abutment agarilnlt e guide 21 is connected to the pump cylinderv 8, guided in the frame 3 and provided with the screw stud 9.

In .the constructional example shown in Fig. 3 the arrangement is such that the ball and the pump cylinder do `not alter their lateral position with respect to the motion of the sliding member 4, but that the sliding member can be adjusted relatively to the axis of the pum and the operating cam. The pump cylin er 8 is screwed into the socket-sha ed extension 23 of a hollow body 24 in whicli the sliding member 4 with its inclinedlsurface 5 is ca able of sliding. The end of the hollow bo y 24 remote from the operating cam 1 is provided with an external .thread on which the hub, 25ct an adjusting lever '26 is screwed. The sliding member 4 extends through the adjusting lever`26 and the latter has at its outer end a collar 27 `in one direction or the other on the hollow body by the adjusting lever 26 being turned, the position of the inclined surface 5 with respect to the ball 6 is altered and consequently, -through the action of the cam 1 on the sliding member 4 being caused to take lace later or sooner, the time and duration o the actionA of the pump is advancedy or retarded. Thus the action of the-pump is retarded with the reduction in the quantity delivered by the fuel pump or vice versa.l A A f.

What I claim is: y 1.` A device for converting in a regulable manner a rotary motion into a reciprocating motion, more particularly for operating fuel pumps for internalcombustion engines, comprising in combination a main member capable of reci rocatin sliding motion, an auxiliary mem ercapa le of reciprocating Isliding motion, an inclined surface on the said auxiliary member, a member capable of'conl tinuous rotary motion and of coacting with the said auxiliary member for imparting the reciprocating motion to it continuously or at `intervals of time, means for yieldingly pressing the main reciprocating member against 3. A device for converting in a regulable i manner a rotary motion-into a reciprocating motion, for operating fuel pumps for internal combustion engines', comprising in combination a pump cylinder, a suction valve for the said cylinder, a cylinder cover capable of acting as an abutment for the suctionvalve, a pistoncapable of sliding in the said cylinder,

an-auxiliary membercapable of a reciprocating sliding motion transversely to the axis of the pump piston, an linclined surface on the said auxiliary member, a-member capable of continuous rotary motion and of coacting with the said auxiliary member for imparting the reciprocating motion to it, a. ball located between the' piston and the vsaid inclined surface, means for yieldingly pressing the piston against the all and the ball against the inclined surface, a plate connected to the pump cylinder, a hole in the said plate for acting as a guide for the ball in the direction of the piston axis and means for adjusting the sald plate and for fixing it in position, whereby the operative space of the cylinder, the quantity delivered by the pump or the stroke of the piston andthe'time and duration of the action of the'pump can be varied, as and for the pur ose set forth.

In testimony whereof, have signed my name to this slpeciiication. v

AL XANDER ABRAMSON.

the auxiliary reciprocating member and means for adj ustinthe position of the main reciprocating mem er with respect to the said inclined surface, as and for the purpose set forth.

2. A device for converting in a regulable manner a rotary motion into a reciprocating motion, for operating fuel pumps for internal combustion engines, comprising in combination a pump cylinder, a piston capable of sliding in the said cylinder, an auxiliary member capable of a reciprocating sliding 4 motion transversely to the axis of the pump piston, an inclined surface on the said auxiliary member, a member capable of continuous rotar motion and of coacting with the said auxi iary member for imparting. the reciprocating motion to it, a ball located between the piston and the said inclined surface, means for yieldingly pressing the piston against the ball and the ball against the inclined surface, a plate connected to'the pump cylinder, a hole in the said late. for acting as a guide for the ,ballin the irection ofthe iston axis and means for adjusting the said) plate and for fixing it in position, whereby the o ,erative space of thecylinder, the quantity i elivered by the pump or the stroke of the piston and the time and'duration of the action of the pump can be varied,

'- as and for the purpose setforth.' 

